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ASRock B850 Pro RS WiFi

ASRockMainstream motherboard

B850 Pro RS WiFi

Released January 2025.2Reviewtech4gamers.com/asrock-b850-pro-rs-wifi-reviewRead 15 October 2026Review published 2025-01-30 for a board on sale. Last checked 16 October 2026.

CPU socket
AM5
Chipset
AMD B850
Form factor
ATX
M.2 slots
4

62 of 78 fields known.

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At a glance

Ports

  • USB-C USB 3.2 Gen 2
  • USB-C USB 3.2 Gen 1
  • 4 USB-A USB 3.2 Gen 1
  • 6 USB-A USB 2.0
  • HDMI 2.1
  • Ethernet (RJ45)
  • 3 3.5 mm audio
  • USB-C header
  • 2 USB 3 header (19-pin)
  • 2 USB 2.0 header (9-pin)

All specs

SourceCalculated

General

Series
Pro1Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026Chapter 1 calls the B850 Pro RS WiFi and the B850 Pro RS one family. The shop copy of ASRock's text calls the Race Sport (RS) Edition an evolution of the PRO series.
Model numbers
B850 Pro RS WiFi, 90-MXBQL0-A0UAYZ1Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026Manual cover: B850 Pro RS WiFi. The order code 90-MXBQL0-A0UAYZ comes from the retailer listings below.5Retailer pagearvutitark.ee/en/pc-components/motherboards/mb-asrock-amd-am5-b850-pro-rs-wifi-1425695Read 15 October 2026Product code 90-MXBQL0-A0UAYZ.6Retailer pageshop.mnetworks.dk/asrock-b850-pro-rs-wifi/cat-p/c/p1005560262Read 15 October 2026Part number 90-MXBQL0-A0UAYZ.
GTIN / EAN
47115814901786Retailer pageshop.mnetworks.dk/asrock-b850-pro-rs-wifi/cat-p/c/p1005560262Read 15 October 2026Lists EAN 4711581490178 for part number 90-MXBQL0-A0UAYZ.7Retailer pagekomputronik.pl/product/955011/plyta-glowna-asrock-b850-pro-rs-wifi.htmlRead 15 October 2026Lists Kod EAN 4711581490178 for manufacturer code B850 Pro RS WiFi.
Announced
Not available
Status
Available4Reviewtech2geek.net/asrock-b850-pro-rs-wi-fi-review-the-budget-motherboard-that-nails-am5-performanceRead 15 October 2026Review of 2025-11-28 with an Amazon price of $159. The board was on sale then.5Retailer pagearvutitark.ee/en/pc-components/motherboards/mb-asrock-amd-am5-b850-pro-rs-wifi-1425695Read 15 October 2026The listing shows 10 pieces available to order on 2026-10-15.
Predecessor
Not available
Successor
Not available
Launch price (US)
$189.992Reviewtech4gamers.com/asrock-b850-pro-rs-wifi-reviewRead 15 October 2026The review's spec table says MSRP $189.99 USD and the summary calls the board a $189.99 motherboard. US price, excl. sales tax. It is a reviewer's statement, not ASRock's.
Launch price (EU)
Not available
Markets
Not available
Colours
Not available
Segment
Mainstream1Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026The board is an ASRock Pro series board (Pro RS). It is not a Phantom Gaming, Steel Legend or Taichi board, so it is mainstream by the field rule.
Board revision
Not available

Platform

CPU socket
AM51Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026
Chipset
AMD B8501Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026
Supported processors
AMD Ryzen 9000 Series, AMD Ryzen 8000 Series, AMD Ryzen 7000 Series1Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026Specifications, page 2: AMD Socket AM5 Ryzen 9000, 8000 and 7000 Series Processors. The manual refers to the maker's website for the CPU support list. Read on 2026-10-15.
CPU overclocking
Yes10Maker product pageamd.com/en/products/processors/chipsets/am5.htmlRead 15 October 2026AMD's chipset page says the B850 platform has enhanced overclocking capabilities and DDR5 memory overclocking with EXPO. This is the chip maker's page, not the board maker's.

Board

Front and side, drawn to scale.

Form factor
ATX1Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026Specifications, page 2: ATX Form Factor.
Board dimensions
Width244Height305mm(9.6 × 12 in)2Reviewtech4gamers.com/asrock-b850-pro-rs-wifi-reviewRead 15 October 2026Spec table: size 305 mm x 244 mm, ATX.6Retailer pageshop.mnetworks.dk/asrock-b850-pro-rs-wifi/cat-p/c/p1005560262Read 15 October 2026ATX Form Factor: 12.0-in x 9.6-in, 30.5 cm x 24.4 cm.7Retailer pagekomputronik.pl/product/955011/plyta-glowna-asrock-b850-pro-rs-wifi.htmlRead 15 October 2026Dimensions table: 244 mm and 305 mm.12Retailer pagecomputermania.co.za/products/asrock-b850-pro-rs-wi-fi-atx-motherboard-amd-am5-ddr5-pcie-5-0Read 15 October 2026Spec copy: ATX Form Factor (30.5 cm x 24.4 cm).
PCB layers
81Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026Specifications, page 2: 8 Layer PCB.2Reviewtech4gamers.com/asrock-b850-pro-rs-wifi-reviewRead 15 October 2026Text: an 8-layer PCB design.4Reviewtech2geek.net/asrock-b850-pro-rs-wi-fi-review-the-budget-motherboard-that-nails-am5-performanceRead 15 October 2026A black 8-layer PCB.
Back-connect design
No1Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026The layout on pages 7 and 8 shows the usual front-side power, fan and USB connectors. The board is not a back-connect design.
RGB lighting on the board
Yes2Reviewtech4gamers.com/asrock-b850-pro-rs-wifi-reviewRead 15 October 2026The text says the board has RGB lighting under the armor of the 3rd and 4th M.2 slots. Tech2Geek describes an aRGB zone on the shared M.2 heatsink. The maker's text that was readable names only the Polychrome RGB headers.4Reviewtech2geek.net/asrock-b850-pro-rs-wi-fi-review-the-budget-motherboard-that-nails-am5-performanceRead 15 October 2026An aRGB zone is integrated in the heatsink shared by two M.2 slots, with customizable lighting. The box names Polychrome Sync aRGB technology.

Power delivery

Power stage layout
14+2+12Reviewtech4gamers.com/asrock-b850-pro-rs-wifi-reviewRead 15 October 2026The same 14+2+1 power phase design with the same 80A SPS for VCore, SOC and MISC.4Reviewtech2geek.net/asrock-b850-pro-rs-wi-fi-review-the-budget-motherboard-that-nails-am5-performanceRead 15 October 2026Two aluminum heatsinks cool the power delivery (14 + 2 + 1, SPS 80A for Vcore, SOC and MISC), with no heatpipe between them.5Retailer pagearvutitark.ee/en/pc-components/motherboards/mb-asrock-amd-am5-b850-pro-rs-wifi-1425695Read 15 October 2026The shop copies ASRock's feature text: 14+2+1 Phase Power Design, 80A Dr.MOS for VCore+SOC+MISC.9Press articleweekly.ascii.jp/elem/000/004/244/4244804Read 15 October 2026Calls it the ATX model of the Pro RS series with a 14+2+1 phase power circuit using Dr.MOS.
CPU core (Vcore) power stages
142Reviewtech4gamers.com/asrock-b850-pro-rs-wifi-reviewRead 15 October 202614 Vcore phases of the 14+2+1 design.4Reviewtech2geek.net/asrock-b850-pro-rs-wi-fi-review-the-budget-motherboard-that-nails-am5-performanceRead 15 October 202614 Vcore stages of the 14+2+1 design.5Retailer pagearvutitark.ee/en/pc-components/motherboards/mb-asrock-amd-am5-b850-pro-rs-wifi-1425695Read 15 October 2026The first number of 14+2+1 is the Vcore rail.
Vcore power stage rating
80A2Reviewtech4gamers.com/asrock-b850-pro-rs-wifi-reviewRead 15 October 202680A SPS for VCore, SOC and MISC.4Reviewtech2geek.net/asrock-b850-pro-rs-wi-fi-review-the-budget-motherboard-that-nails-am5-performanceRead 15 October 2026SPS 80A for Vcore, SOC and MISC.5Retailer pagearvutitark.ee/en/pc-components/motherboards/mb-asrock-amd-am5-b850-pro-rs-wifi-1425695Read 15 October 202680A Dr.MOS for VCore+SOC+MISC, as the shop copies ASRock's text.
VRM controller
Not available
CPU power connectors
8+8 pin1Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026Connector list: 1 x 24 pin ATX power connector and 2 x 8 pin 12V power connectors (Hi-Density Power Connector).
Extra slot power connector
No1Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026The connector list has no extra slot power connector. The manual never states that one is absent.

Memory

Memory type
DDR51Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026
Memory slots
41Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026
Max memory
256GB1Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026Specifications, page 2: 4 x DDR5 DIMM slots, max. capacity of system memory 256GB, dual channel.
Max memory speed (overclocked)
8,000MT/s1Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026Supports DDR5 ECC/non-ECC, un-buffered memory up to 8000+(OC). The manual names no CPU family or module setup. It refers to the Memory Support List on the maker's website.
ECC memory
Yes1Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026The manual says DDR5 ECC/non-ECC, un-buffered memory. It does not say whether ECC is active with each CPU.
CUDIMM support
Not available

Expansion slots

Expansion slots
Physical slotElectrical lanesPCIe generationConnected toCount
PCIe x16165CPU1
PCIe x1644Chipset1
Source1Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026CPU: 1 x PCIe 5.0 x16 slot (PCIE1) at x16. PCIE1 runs Gen5x16 with Ryzen 9000 and 7000, Gen4x8 with Ryzen 8000 (Phoenix 1) and Gen4x4 with Ryzen 8000 (Phoenix 2). Chipset: 1 x PCIe 4.0 x16 slot (PCIE2) at x4, which is disabled when M2_3 is occupied. The M.2 socket (Key E) for the Wi-Fi module is not listed.
Full-length PCIe slots
2
Fastest PCIe x16 slot generation
5

Storage

M.2 storage slots
SlotPCIe generationPCIe lanesConnected toLongest driveTakes SATA drivesHeatsinkShares lanes with
M2_154CPUM.2 2280NoYesNot available
M2_244CPUM.2 2280NoNoNot available
M2_344ChipsetM.2 2280NoYesPCIE2 is disabled when M2_3 is used
M2_434ChipsetM.2 2280NoYesM2_4 runs at PCIe 3.0 x2 when SATA3_1 or SATA3_2 is used
Source1Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026CPU: M2_1 (Blazing M.2, Key M) type 2280 PCIe Gen5x4 and M2_2 (Hyper M.2) type 2280 PCIe Gen4x4. M2_1 runs Gen5x4 with Ryzen 9000 and 7000 and Gen4x4 with Ryzen 8000. M2_2 runs Gen4x4 with Ryzen 9000, 7000 and 8000 (Phoenix 1) and Gen4x2 with 8000 (Phoenix 2). Chipset: M2_3 (Hyper M.2) type 2230/2242/2260/2280 PCIe Gen4x4 and M2_4 (Ultra M.2) type 2280 PCIe Gen3x4. 2280 is stored for M2_3. If M2_3 is occupied PCIE2 is disabled. If SATA3_1 or SATA3_2 is occupied M2_4 downgrades to Gen3x2. The manual lists every slot with PCIe modes only, so sata is false. The install guides in sections 2.16 to 2.19 show a heatsink to remove on M2_1, M2_3 and M2_4 and none on M2_2. Tech4Gamers confirms three of four slots have heatsinks and M2_2 has none.2Reviewtech4gamers.com/asrock-b850-pro-rs-wifi-reviewRead 15 October 2026M.2_1 is PCIe Gen5, M.2_2 and M.2_3 are PCIe Gen4 and M.2_4 is PCIe Gen3. Only 3 out of 4 slots have heatsinks, and M.2_2 has none. M.2_4 drops to Gen3x2 when SATA3_1 and SATA3_2 are used.
M.2 slots
4
PCIe 5.0 M.2 slots
1
SATA ports
41Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026Specifications: 2 x SATA3 6.0 Gb/s connectors on the chipset and 2 x SATA3 6.0 Gb/s connectors on an ASMedia ASM1061.

Rear ports

Rear ports
TypeVersionCountMax link rate (Gbps)DP Alt Mode
USB-CUSB 3.2 Gen 2110Not available
USB-CUSB 3.2 Gen 115Yes
USB-AUSB 3.2 Gen 145Not available
USB-AUSB 2.060.48Not available
HDMIHDMI 2.11Not availableNot available
Ethernet (RJ45)Not available12.5Not available
3.5 mm audioNot available3Not availableNot available
Source1Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026Specifications and section 1.4 rear panel: 1 HDMI (HDMI 2.1 TMDS/FRL 8G compatible, up to 4K 120Hz), 1 USB 3.2 Gen2 Type-C (10 Gb/s), 1 USB 3.2 Gen1 Type-C (DP-alt mode DP1.4a, up to 4K 60Hz), 4 USB 3.2 Gen1 Type-A, 6 USB 2.0, 1 RJ-45 2.5G LAN and 3 HD audio jacks (Line in, Front Speaker, Microphone). The block diagram prints 5Gb/s for the Gen2 Type-C port, which the specifications list as 10 Gb/s. The specifications are stored. The two antenna ports and the BIOS Flashback button are not ports.
Rear USB ports
12
Rear USB-C ports
2
Fastest rear USB port
10Gbps
Thunderbolt
Not available

Internal connectors

Internal USB headers
HeaderMax data rate (Gbps)HeadersFront ports served
USB-C header2011
USB 3 header (19-pin)524
USB 2.0 header (9-pin)0.4824
Source1Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026Connector list: 1 x Front Panel Type C USB 3.2 Gen2x2 header (20 Gb/s), 2 x USB 3.2 Gen1 headers for 4 ports and 2 x USB 2.0 headers for 4 ports. The manual states no USB power output.
Front USB-C header speed
20Gbps
Fan headers
71Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026Connector list: 2 x CPU fan connectors, 4 x chassis fan connectors and 1 x AIO pump fan connector, all 4-pin.
ARGB headers
31Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026Connector list: 3 x Addressable LED headers (up to 5V/3A, 15W in total).
RGB headers
11Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026Connector list: 1 x RGB LED header (up to 12V/3A, 36W in total).

Networking

Ethernet controllers
Realtek RTL81251Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026Specifications: 2.5 Gigabit LAN with the Dragon RTL8125BG. The block diagram labels it Realtek 2.5G LAN RTL8125BG. The suffix BG is stored without letters.2Reviewtech4gamers.com/asrock-b850-pro-rs-wifi-reviewRead 15 October 2026Dragon RTL8125BG LAN controller, up to 2.5G.
Ethernet ports
1
Ethernet speed
2.5Gbps
Wi-Fi included
Yes1Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026Section 1.6 and specifications: the B850 Pro RS WiFi comes with an 802.11axe Wi-Fi 6E and BT module in the Key E socket.
Wi-Fi standard
Wi-Fi 6E1Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026Specifications: 802.11axe Wi-Fi 6E module, IEEE 802.11a/b/g/n/ac/ax/axe, dual-band 2x2 with extended 6GHz band support.
Wi-Fi bands
2.4 GHz, 5 GHz, 6 GHz1Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026The module has an extended 6GHz band and the antennas are named ASRock WiFi 2.4/5/6 GHz Antennas. The 6 GHz band depends on Windows 11 and on country rules.
Max Wi-Fi channel width
Not available
Wi-Fi module
Not available
Bluetooth
5.21Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026Specifications and section 1.6: Bluetooth 5.2.

Audio

Audio codec
Realtek ALC8971Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026Specifications: 7.1 CH HD Audio (Realtek ALC897 Audio Codec) with Nahimic Audio.2Reviewtech4gamers.com/asrock-b850-pro-rs-wifi-reviewRead 15 October 2026Realtek ALC897 audio codec.
DAC chip
Not available

Features

BIOS flashback
Yes1Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 20261 x BIOS Flashback button on the rear panel. Section 2.13 calls it the only smart switch.
Clear CMOS button (rear)
No1Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026The layout lists a Clear CMOS jumper (CLRCMOS1). The only rear panel button is BIOS Flashback.
POST code display
No1Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026The layout lists a Post Status Checker (PSC, section 2.14). It is four colour LEDs for CPU, DRAM, VGA and BOOT, not a two-digit display.
Power button on the board
No1Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026Section 2.13 says the only smart switch is the BIOS Flashback button. The layout lists no power or reset button.
Dual BIOS
No1Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026The block diagram shows one flash ROM. Dual BIOS is not stated.
Pre-installed I/O shield
Not available
Tool-free features
Tool-free M.2 latch1Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026The install guides for all four M.2 sockets use a nut lock that is turned clockwise to lock a 2280 module in place without a screw. The heatsinks need a screwdriver and are not tool-free. The Wi-Fi antennas screw on. The manual names no PCIe release button.

Measured

VRM temperature under CPU load
65°C3Measurementtech4gamers.com/asrock-b850-pro-rs-wifi-reviewRead 15 October 2026Chart: VRM temperature 65 C. Ryzen 9 9950X at stock, 24 C room temperature, 30 minutes of Cinebench 2024. The test bench also has an Arctic Liquid Freezer II 420 and an RTX 4090. The sensor and the CPU package power are not stated.
Power draw idle
105W3Measurementtech4gamers.com/asrock-b850-pro-rs-wifi-reviewRead 15 October 2026Chart: idle 105 W with the same Ryzen 9 9950X system. The text calls it power consumption and does not name the meter. The method is not stated, so this is read as whole system power.
Power draw CPU stress
370W3Measurementtech4gamers.com/asrock-b850-pro-rs-wifi-reviewRead 15 October 2026Chart: load 370 W, and the text says full load, with the same system. The stress test, the meter and whether the graphics card was loaded are not stated.

In the box

In the box
2 x Serial ATA (SATA) data cables, 2 x ASRock WiFi 2.4/5/6 GHz antennas, Quick Installation Guide, Regulatory Notice1Owner's manualdownload.asrock.com/Manual/B850%20Pro%20RS%20WiFi.pdfRead 15 October 2026Section 1.1: 2 x Serial ATA (SATA) data cables (optional) and 2 x ASRock WiFi 2.4/5/6 GHz antennas (optional) for the WiFi model. Tech4Gamers adds a Quick Installation Guide and a Regulatory Notice.2Reviewtech4gamers.com/asrock-b850-pro-rs-wifi-reviewRead 15 October 2026Accessories: two SATA cables, two ASRock WiFi 2.4/5/6 GHz antennas, Quick Installation Guide and Regulatory Notice.

Warranty

Manufacturer warranty (source market)
3years5Retailer pagearvutitark.ee/en/pc-components/motherboards/mb-asrock-amd-am5-b850-pro-rs-wifi-1425695Read 15 October 2026Warranty (months) 36. The market is Estonia.

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  1. Read 15 October 2026Backs 38 fields
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